HELP I can't find the node as shown in the video

The video is talking about to create anim notify state for niagara 4.22, but in the last part, I just cannot find the node that he talk about.

This is the video link: UE4 Anim Notify for Niagara Particle System Guide. - YouTube

Could anyone explain the node? Very thanks in advance.

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Its niagara component system. Under local variables. You can’t see it because the
drop down list is closed.